Regulation of the load of electric motors of cutting machines and coal combines (Equation of motion of machines)

Abstract

Theoretical and experimental studies have established that the highest productivity of cutting machines and coal combines can be achieved by automatic equalization of the load on their electric motors using appropriate automatic regulators. The load on the electric motors must be equalized by changing the feed rate of the machines at a constant cutting speed. The choice of the structural diagram of the regulator, its individual elements and the parameters of these elements is determined by the properties of the regulated object. To determine the properties of the regulated object, it is necessary first to consider the nature of the change in the load on the electric motor during the regulation process, and then find the equation of motion of the machine. When the load on the electric motor changes during operation, the regulator will change the feed rate by changing the gear ratio between the motor shaft and the feed drum shaft until the motor power is restored to the nominal value.